LM2576-12 MOTOROLA [Motorola, Inc], LM2576-12 Datasheet - Page 23

• Manufacturer Part Number: LM2576-12
• Description: Easy Switcher 3.0A Step-Down Voltage Regulator
• Manufacturer: MOTOROLA [Motorola, Inc]

References
MOTOROLA ANALOG IC DEVICE DATA
National Semiconductor LM2576 Data Sheet and Application Note
National Semiconductor LM2595 Data Sheet and Application Note
Marty Brown “Practical Switching Power Supply Design”, Academic Press, Inc., San Diego 1990
Ray Ridley “High Frequency Magnetics Design”, Ridley Engineering, Inc. 1995
+V in
Gnd in
THE LM2576–ADJ STEP–DOWN VOLTAGE REGULATOR WITH 8.0 V @ 1.0 A OUTPUT POWER
+V in = 10 V to 40 V
Figure 39. Printed Circuit Board Layout
Figure 38. Schematic Diagram of the 8.0 V @ 3.0 A Step–Down Converter Using the LM2576–ADJ
Unregulated
DC Input
+
C1
CAPABILITY. TYPICAL APPLICATION WITH THROUGH–HOLE PC BOARD LAYOUT
100 F
/50 V
C1
C2
D1
L1
R1
R2
C1
D1
–
–
–
–
–
–
NOTE: Not to scale.
Component Side
LM2576
100 F, 50 V, Aluminium Electrolytic
1000 F, 16 V, Aluminium Electrolytic
3.0 A, 40 V, Schottky Rectifier, 1N5822
150 H, RL2444, Renco Electronics
1.8 k , 0.25 W
10 k , 0.25 W
L1
U1
+V in
1
3
LM2576–ADJ
Gnd
4
R1
R2
Feedback
C2
ON/OFF
5
+
ON/OFF
2
Output
ON/OFF
Gnd out
V out
LM2576
D1
1N5822
150 H
L1
Figure 40. Printed Circuit Board Layout
C2
1000 F
/16 V
R1
1.8 k
Copper Side
R2
10 k
V
V ref = 1.23 V
R1 is between 1.0 k and 5.0 k
NOTE: Not to scale.
out
+
V
ref
)
V out2 = 8.0 V @ 3.0 A
Regulated
Output Filtered
1.0
)
R2
R1
23